mattermost update to 9.10.0-bb.1

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/product/packages/mattermost/-/blob/9.10.0-bb.1/CHANGELOG.md

Package MR

big-bang/product/packages/mattermost!254 (merged)

For Issue

Closes #2164 (closed)

Upgrade Notices

N/A

added botmr mattermost statusreview labels

assigned to @benjamin.starks

changed the description

requested review from @chris.oconnell, @michaelmartin, and @andrewshoell

changed milestone to %2.33.0

approved this merge request

marked this merge request as ready

changed the description

merged

mentioned in commit 4f0a6e22

mentioned in merge request big-bang/customers/template!95 (merged)